872 NOTES ON FRUIT-FLIES. 



Chietotactic characters as in Dacus passijlorce, except- 

 that there are four bristles on the hind margin of the thorax, 

 two behind the scutellura and one on either side. 



Hab. — C?) Bred from Island fruit imported into New Zealand 

 (T. Kirk); bred also from peaches. 



Dacus RAROTONGiE, n.sp. 



Length 9 ram. 



Head ochreous, blotch round the ocelli and back of head black, 

 eyes dark brown. Thorax shining black; humeri small, nude 

 area on mesopleura large and angular, with a rounded blotch on 

 each side of the hypopleura pale yellow; scutelliim black. Wings 

 hyaline, nervures light brown, slightly fuscous on the costal 

 edge. Legs fuscous, hind pair almost black. Abdomen of male 

 oval, pointed at apex; of female almost diamond-shaped, angular 

 on the sides, sloping down from the middle to the small truncate 

 apex; anal segment and ovipositor yellow. Dorsal surface of 

 thorax and abdomen covered with fine scattered grey pubescence. 



Chsetotactic characters . — Head similar to that of 

 D. 2)assiJlor(e, with the addition of a pair of short bristles on the 

 sides of the lower ocellus. Thorax with two bristles on either 

 side of front margin; five on either side above scutellum, two 

 short bristles with a longer one on either side; scutellum with a 

 pair of long bristles. 



Hab. — ■E.arotonga[Cook Islands](T. Kirk; bred from mangoes). 



RioxA (Trypeta) mus.e Ftoggatt. 



Professor Bezzi, to whom I sent specimens of this and other 

 Australian fruit-flies, informs me that this species, which I 

 referred to the genus TryppAa in my original description, should 

 be assigned to Rioxa, which contains about half-a-dozen species, 

 confined to the Malay Islands. He says of it : " A distinct 

 form from all the other species of Rioxa, distinguished by the 

 wholly black stigma on the wings." 



